From: Christoph Hellwig <hch@infradead.org>
To: "Christian König" <christian.koenig@amd.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Jason Gunthorpe <jgg@nvidia.com>,
Alex Williamson <alex.williamson@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
dri-devel@lists.freedesktop.org, kvm@vger.kernel.org,
linaro-mm-sig@lists.linaro.org, linux-media@vger.kernel.org,
Sumit Semwal <sumit.semwal@linaro.org>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
Leon Romanovsky <leon@kernel.org>,
linux-rdma@vger.kernel.org, Maor Gottlieb <maorg@nvidia.com>,
Oded Gabbay <ogabbay@kernel.org>
Subject: Re: [PATCH v2 4/4] vfio/pci: Allow MMIO regions to be exported through dma-buf
Date: Wed, 7 Sep 2022 05:03:30 -0700 [thread overview]
Message-ID: <YxiIkh/yeWQkZ54x@infradead.org> (raw)
In-Reply-To: <b6b5d236-c089-7428-4cc9-a08fe4f6b4a3@amd.com>
On Tue, Sep 06, 2022 at 12:38:44PM +0200, Christian König wrote:
> The problem is once more that this is MMIO space, in other words register
> BARs which needs to be exported/imported.
Everything used for P2P is bar space.
> Adding struct pages for it generally sounds like the wrong approach here.
> You can't even access this with the CPU or would trigger potentially
> unwanted hardware actions.
How would an access from the CPU vs anther device make any difference?
> Would you mind if I start to tackle this problem?
Yes, I've been waiting forever for someone to tacke how the scatterlist
is abused in dma-buf..
next prev parent reply other threads:[~2022-09-07 12:03 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-31 23:12 [PATCH v2 0/4] Allow MMIO regions to be exported through dma-buf Jason Gunthorpe
2022-08-31 23:12 ` [PATCH v2 1/4] dma-buf: Add dma_buf_try_get() Jason Gunthorpe
2022-09-01 7:55 ` Christian König
2022-09-06 16:44 ` Jason Gunthorpe
2022-09-06 17:52 ` Christian König
2022-08-31 23:12 ` [PATCH v2 2/4] vfio: Add vfio_device_get() Jason Gunthorpe
2022-08-31 23:12 ` [PATCH v2 3/4] vfio_pci: Do not open code pci_try_reset_function() Jason Gunthorpe
2022-08-31 23:12 ` [PATCH v2 4/4] vfio/pci: Allow MMIO regions to be exported through dma-buf Jason Gunthorpe
2022-09-06 9:51 ` Christoph Hellwig
2022-09-06 10:38 ` Christian König
2022-09-06 11:48 ` Jason Gunthorpe
2022-09-06 12:34 ` Oded Gabbay
2022-09-06 17:59 ` Jason Gunthorpe
2022-09-06 19:44 ` Oded Gabbay
2022-09-07 12:07 ` Christoph Hellwig
2022-09-07 12:05 ` Christoph Hellwig
2022-09-07 12:33 ` Jason Gunthorpe
2022-09-07 14:29 ` Christoph Hellwig
2022-09-07 14:46 ` Oded Gabbay
2022-09-07 15:23 ` Jason Gunthorpe
2022-09-07 15:32 ` Christoph Hellwig
2022-09-07 16:12 ` Jason Gunthorpe
2022-09-09 13:24 ` Christoph Hellwig
2022-09-09 14:09 ` Jason Gunthorpe
2022-09-07 16:31 ` Robin Murphy
2022-09-07 16:47 ` Jason Gunthorpe
2022-09-07 17:03 ` Dan Williams
2022-09-07 15:01 ` Robin Murphy
2022-09-07 12:03 ` Christoph Hellwig [this message]
2022-09-07 15:08 ` Christian König
2022-09-07 15:23 ` Christoph Hellwig
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